CVE-2021-3948: An incorrect default permissions vulnerability was found in the mig-controller

Routine

MEDIUM 6.3WATCHLISTUPGRADEDOWNGRADEDOWNGRADE

CVE-2021-3948 is a medium-severity flaw (CVSS 6.3) affecting mig-controller, migration toolkit, migration toolkit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An incorrect default permissions vulnerability was found in the mig-controller. Due to an incorrect cluster namespaces handling an attacker may be able to migrate a malicious workload to the target cluster, impacting confidentiality, integrity, and availability of the services located on that cluster.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-276
Published	2022-02-18
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: konveyor · redhat

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-02-18 18:15 UTCPublished CVE record published
2026-06-17 04:06 UTCUpdated Record last modified

konveyor mig-controller UPGRADE

Affected: < 1.5.2 · >= 1.6.0 and < 1.6.3

Fixed in: 1.5.2, 1.6.3

Safe to downgrade to: a release before 1.6.0

1. Check installed version

apt-cache policy mig-controller || rpm -q mig-controller || mig-controller --version

2. UPGRADE to 1.5.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mig-controller

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mig-controller

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.6.0 (Debian / Ubuntu)

apt-cache madison mig-controller sudo apt install mig-controller=<VERSION_BEFORE_1.6.0> sudo apt-mark hold mig-controller

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mig-controller sudo dnf downgrade mig-controller-<VERSION_BEFORE_1.6.0> sudo dnf versionlock add mig-controller

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

redhat migration toolkit DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy migration-toolkit || rpm -q migration-toolkit || migration-toolkit --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison migration-toolkit sudo apt install migration-toolkit=<VERSION_BEFORE_1.0> sudo apt-mark hold migration-toolkit

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list migration-toolkit sudo dnf downgrade migration-toolkit-<VERSION_BEFORE_1.0> sudo dnf versionlock add migration-toolkit

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

redhat migration toolkit DOWNGRADE

Affected: 1.5 · 1.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.5

1. Check installed version

apt-cache policy migration-toolkit || rpm -q migration-toolkit || migration-toolkit --version

2. No fixed release: DOWNGRADE to a release before 1.5 (Debian / Ubuntu)

apt-cache madison migration-toolkit sudo apt install migration-toolkit=<VERSION_BEFORE_1.5> sudo apt-mark hold migration-toolkit

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list migration-toolkit sudo dnf downgrade migration-toolkit-<VERSION_BEFORE_1.5> sudo dnf versionlock add migration-toolkit

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-3948?

mig-controller: upgrade to 1.5.2, 1.6.3; migration toolkit: downgrade or apply the listed mitigation; migration toolkit: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-3948 being exploited?

CVE-2021-3948 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-3948 affect?

CVE-2021-3948 affects mig-controller, migration toolkit, migration toolkit. Severity is medium (CVSS 6.3). An incorrect default permissions vulnerability was found in the mig-controller. Due to an incorrect cluster namespaces handling an attacker may be able to migrate a malicious workload to the target cluster, impacting confidentiality, integr

How urgent is CVE-2021-3948?

Priority 39/100. On your watchlist

References

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